New MASS EFFECT 3 'Take Earth Back' Trailer
In a series known for delivering one of the most cinematic experiences in all of interactive entertainment with an emphasis on high quality digital acting, BioWare is aiming to once again set a new bar with Mass Effect™ 3.
Not everyone will survive. An ancient alien race, known only as "Reapers", has launched an all-out invasion leaving nothing but a trail of destruction in their wake. Earth has been taken, the galaxy is on the verge of total annihilation, and you are the only one who can stop them. The price of failure is extinction.
You are Commander Shepard, a character that you can forge in your own image. You determine how events will play out, which planets to explore, and whom to form alliances with as you rally a force to eliminate the Reaper threat once and for all. Mass Effect 3 will react to each decision you make as you play through a truly unique experience of your own creation.
The star-studded cast for Mass Effect 3 includes the return of Golden Globe winner Sheen (“The Departed”, “Apocalypse Now”), Seth Green (“Robot Chicken”, “Family Guy”) as Joker, Tricia Helfer (“Battlestar Galactica”) as the Normandy’s A.I. EDI, Yvonne Strahovski (“Chuck”) as Miranda, and Carrie-Anne Moss (“The Matrix”) as Aria T'Loak. Other returning fan favorites include Meer and Hale as Male and Female Shepard, Ali Hillis as Dr. Liara T’Soni, Keith David (“Platoon”) as Captain Anderson and Lance Henriksen (“Aliens”) as Admiral Steven Hackett. Prinze, Jr. (“24”) and Jessica Chobot (G4 TV) as news reporter Diana Allers, are the newcomers to the series.
Mass Effect 3 arrives on the Xbox 360® videogame and entertainment system, PlayStation®3 computer entertainment system and PC in North America on March 6, 2012 and in Europe on March 9, 2012 and is available for pre-order now at participating retailers. Fans who pre-order have the opportunity to arm themselves with cutting-edge in-game weapons and armor to prepare for the all-out galactic war.
Source:
Gamerant 
